I would be very grateful if you could provide me with an impedance matching circuit which would convert a “2k2 ohm Electret microphone into a standard low impedance mic input (50mv – 2v at 100 ohm).
Many thanks in anticipation..
Kind regards
Simon

 

You seem to have a misconception about impedance matching. Matching the impedance of the mic will reduce the output voltage by a factor of two. Connecting it to a high input impedance amp will pass the entire output voltage giving you twice the signal of the impedance matched one.

 

This is a Circuit from Texas-Instruments,
it will work with almost any High-Quality Op-Amp.
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You seem to have a misconception about impedance matching. Matching the impedance of the mic will reduce the output voltage by a factor of two. Connecting it to a high input impedance amp will pass the entire output voltage giving you twice the signal of the impedance matched one.

Hi BobTPH
Yes, it is most likely I am confused, hence my post. To clarify, I am trying to connect an avionics headset which has an electret 2,2k ohm impedance microphone to an airband radio which expects a standard low impedance mic. I have attached the transciever input specification for clarity.
Kind regards
Simon